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Structure formation on the brane: A mimicry

Supratik Pal

  • Department of Physics and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721 302, India and Relativity and Cosmology Research Centre, Department of Physics, Jadavpur University, Kolkata 700 032, India

  • *Electronic address: supratik@cts.iitkgp.ernet.in
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Phys. Rev. D 74, 024005 – Published 6 July, 2006

DOI: https://doi.org/10.1103/PhysRevD.74.024005

Abstract

We show how braneworld cosmology with bulk matter can explain structure formation. In this scenario, the nonlocal corrections to the Friedmann equations supply a Weyl fluid that can dominate over matter at late times due to the energy exchange between the brane and the bulk. We demonstrate that the presence of the Weyl fluid radically changes the perturbation equations, which can take care of the fluctuations required to account for the large amount of inhomogeneities observed in the local universe. Further, we show how this Weyl fluid can mimic dark matter. We also investigate the bulk geometry responsible for the scenario.

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Phys. Rev. D 74, 024005– Published 6 July, 2006
  • Received 7 March 2006

© 2006 American Physical Society

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